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From: Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de>
To: Keith Packard <keithp@keithp.com>
Cc: Pekka Enberg <penberg@kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>,
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        Florian Mickler <florian@mickler.org>, Robse <rob-se@live.de>,
        Chris Wilson <chris@chris-wilson.co.uk>
Subject: Re: [Bug #37472] Lenovo U160 (i915 black screen)
In-Reply-To: <yun7h7pg8y7.fsf@aiko.keithp.com> (Keith Packard's message of
	"Sun, 10 Jul 2011 13:46:40 -0700")
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Date: Tue, 12 Jul 2011 10:27:01 +0200
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Keith Packard <keithp@keithp.com> writes:

> On Sun, 10 Jul 2011 14:56:19 +0300, Pekka Enberg <penberg@kernel.org> wrote:
>
>> There's no mention that the i915 developers know about this problem so
>> I'm CC'ing Keith and Chris.
>
> Thanks. I've added a comment to the bug:
>
> First off, of course you are encouraged to re-test with 3.0-rc6 just to
> make sure it hasn't changed in some way. I don't think anything has
> changed enough to affect this, but it's always good to be sure.
>
> I note a long sequence of patches that are supposed to help with the
> U160:
>
> 448f53a1ede54eb854d036abf54573281412d650 drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks
> bcfbbce822d219eb587acaba8a6e062bbeae4761 Revert "drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks"
> a76150302d6e7ebc43e1a1ddaee7fd51db8da3b3 drm/i915: Add a module option to override the use of SSC
>
> I'm not sure why a quirk wasn't added for this hardware; it's clearly
> 'non-standard' in some mystic way.

On June 27th, I proposed that Robse perhaps could try the workaround
that was introduced with the latter commit: i915.lvds_use_ssc=0.

It works well on my hardware and probably solves his problem as well,
but he did not respond...

Dirk

[1] https://lkml.org/lkml/2011/6/27/45